[dnautics]

Actually the parent is correct. "That's not how it works". Specifically deer prions (but not other cervids like elk) don't seem to be transmissible to cows, both in the lab and in the wild, and not to mice or humans in the lab. It goes in both ways IIRC, cows nor mice can't go to deer.

[Scaevolus]

Here's a citation for that: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4981193/

If it appeared to be transmissible to humans, there would be much stronger recommendations against eating venison, like with prion diseases in cows.